Python Generators

1) Simple Generator Function

Write a generator function count_up_to(n) that yields numbers from 1 to n. Test it with n = 5.

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2) Generator for Even Numbers

Write a generator that yields even numbers from 2 up to 20.

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3) Use next()

Call the generator from #1 and get values using next() until it ends.

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4) Catch Generator End

Use try/except StopIteration while calling next() to safely stop.

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5) Loop Through Generator

Use a for loop to print values from a generator that yields 1,2,…,10.

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6) Generator for Squares

Write a generator that yields squares of numbers from 1 to 10.

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7) Generator Expression (List)

Use a generator expression to yield cube values for numbers 1–5, then convert to a list.

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8) Yield Characters of a String

Write a generator that yields each character of a user-entered string.

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9) Even Filter Generator

From a list [1,2,3,…,10], use a generator expression to yield only even numbers.

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10) Infinite Generator (but stop at 10)

Write a generator that yields integers starting from 1 indefinitely. Use a loop to print first 10 values.

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11) Generator for Fibonacci

Write a generator that yields Fibonacci sequence numbers up to n terms.

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12) Yield Word Lengths

Given list ["cat","dog","lion"], write a generator to yield each word’s length.

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13) Prime Number Generator

Write a basic generator that yields prime numbers up to 50.

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14) Generator to Read File

Write a generator that reads a text file line by line (yield each line). Test with a small sample file.

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15) Combined Generator Expression

Create nested generator expression that yields all products i * j for i in [1,2] and j in [3,4].

Expected output:

[3,4,6,8]

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16) Filter & Transform

Given list [1,2,3,4,5,6], use generator expression to yield squares only of odd numbers.

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17) Delay Execution Demo

Create a generator that prints a message before yielding each number — show it prints only when you iterate.

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18) Generator with yield from

Make a generator that yields values from two other generators using yield from.

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19) Generator for Alphabet

Write a generator that yields letters a to z (use string.ascii_lowercase or ord/chr logic).

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20) Custom Step Generator

Write a generator function step_generator(start, step, limit) yielding values:

start, start+step, start+2*step … up to ≤ limit

Test with start=2, step=3, limit=20.

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🧠 Concepts Practiced

Topic	Example
yield keyword	Creating generator functions
Generator expressions	[x*2 for x in …] but as (x*2 for x in …)
next()	Manual iteration
StopIteration	End of generator
yield from	Delegating to another iterator
Infinite/finite iteration	Controlled loops

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📌 Starter Snippet

Basic generator

def count_up_to(n):
    i = 1
    while i <= n:
        yield i
        i += 1

for num in count_up_to(5):
    print(num)

Generator expression

squares = (x*x for x in range(1,6))
print(list(squares))

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canvil: 333f6c7d-6876-4f7e-b6ad-1bdb2233f5c1